KVM: Add kvm_free_lapic() to pair with kvm_create_lapic()

Instead of the asymetry of kvm_free_apic, implement kvm_free_lapic().
And guess what?  I found a minor bug: we don't need to hrtimer_cancel()
from kvm_main.c, because we do that in kvm_free_apic().

Also:
1) kvm_vcpu_uninit should be the reverse order from kvm_vcpu_init.
2) Don't set apic->regs_page to zero before freeing apic.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Avi Kivity <avi@qumranet.com>

3 files changed, 11 insertions, 14 deletions

diff --git a/drivers/kvm/irq.h b/drivers/kvm/irq.h
index 11fc014e2b30..508280ea6fcf 100644
--- a/drivers/kvm/irq.h
+++ b/drivers/kvm/irq.h
@@ -139,7 +139,7 @@ int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu);
 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu);
 int kvm_create_lapic(struct kvm_vcpu *vcpu);
 void kvm_lapic_reset(struct kvm_vcpu *vcpu);
-void kvm_free_apic(struct kvm_lapic *apic);
+void kvm_free_lapic(struct kvm_vcpu *vcpu);
 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu);
 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8);
 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value);
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 2bb1f2f66efa..b19734606cd9 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -268,10 +268,8 @@ EXPORT_SYMBOL_GPL(kvm_vcpu_init);
 
 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 {
+        kvm_free_lapic(vcpu);
         kvm_mmu_destroy(vcpu);
-        if (vcpu->apic)
-                hrtimer_cancel(&vcpu->apic->timer.dev);
-        kvm_free_apic(vcpu->apic);
         free_page((unsigned long)vcpu->pio_data);
         free_page((unsigned long)vcpu->run);
 }
diff --git a/drivers/kvm/lapic.c b/drivers/kvm/lapic.c
index 238fcad3cece..8e8dab08be58 100644
--- a/drivers/kvm/lapic.c
+++ b/drivers/kvm/lapic.c
@@ -762,19 +762,17 @@ static int apic_mmio_range(struct kvm_io_device *this, gpa_t addr)
         return ret;
 }
 
-void kvm_free_apic(struct kvm_lapic *apic)
+void kvm_free_lapic(struct kvm_vcpu *vcpu)
 {
-        if (!apic)
+        if (!vcpu->apic)
                 return;
 
-        hrtimer_cancel(&apic->timer.dev);
+        hrtimer_cancel(&vcpu->apic->timer.dev);
 
-        if (apic->regs_page) {
-                __free_page(apic->regs_page);
-                apic->regs_page = 0;
-        }
+        if (vcpu->apic->regs_page)
+                __free_page(vcpu->apic->regs_page);
 
-        kfree(apic);
+        kfree(vcpu->apic);
 }
 
 /*
@@ -962,7 +960,7 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu)
         if (apic->regs_page == NULL) {
                 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
                        vcpu->vcpu_id);
-                goto nomem;
+                goto nomem_free_apic;
         }
         apic->regs = page_address(apic->regs_page);
         memset(apic->regs, 0, PAGE_SIZE);
@@ -980,8 +978,9 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu)
         apic->dev.private = apic;
 
         return 0;
+nomem_free_apic:
+        kfree(apic);
 nomem:
-        kvm_free_apic(apic);
         return -ENOMEM;
 }
 EXPORT_SYMBOL_GPL(kvm_create_lapic);